超声强化多通道陶瓷膜微滤超细TiO2悬浮液

Microfiltration of fine TiO_2 suspension with ultrasound-enhanced multi-channel ceramic membrane

针对超声强化膜分离过程能耗高的问题,提出并设计了一种新型超声强化膜分离操作方式,并进行了超声强化陶瓷膜微滤超细TiO2颗粒悬浮液的研究。考察了超声场参数、操作时间及溶液环境对多通道陶瓷膜微滤过程的影响规律,并分析了此操作方式强化陶瓷膜微滤颗粒悬浮体系的机理。结果表明,该操作方式能够获得较高膜通量恢复率及平均膜通量,同时超声能量消耗减小了90.0%以上;降低超声频率及提高功率,有利于膜通量恢复,在超声参数45kHz和0.33W.cm-2条件下,膜通量恢复到初始值的94.0%;控制超声辐射时间0.167min,微滤时间8min时,平均膜通量提高了61.5%;降低悬浮液颗粒浓度及提高料液温度都有利于超声场强化陶瓷膜微滤过程。

A new operation mode for ultrasound-enhanced membrane microfiltration was designed in order to reduce energy consumption.Microfiltration of TiO2 suspension with ultrasound-enhanced multi-channel ceramic membrane was demonstrated.Factors that influenced membrane microfiltration,such as ultrasonic parameters,operating time,TiO2 concentration,as well as suspension temperature,were discussed.The primary mechanism for enhancing the effect of ultrasound was analyzed.The results showed that with the operation mode,the flux recovery rate and average permeation flux were better,and the ultrasonic energy consumption was reduced by over 90.0%.Lower ultrasonic frequency and higher power density were conducive to restoration of the initial flux.Under the optimum condition,ultrasonic frequency of 45 kHz and power density of 0.33 W·cm^-2,the flux recovery rate could reach 94.0%.With ultrasonic radiation time of 0.167 min and microfiltration for 8 min,the average flux could increase 61.5%.Lower TiO2 concentration and higher temperature benefited the microfiltration process.